One thread that is longer than a single Bill Gulley post! All

I find if I am consistently mailing once per week over a month period to "distressed mortgage situations" it yields higher responses than monthly mailings.Also a technique we use is when we have a certain area hitting we will do an EDDM (every door direct mail) post card through the postal service to that mail carriers route.

If it was one order, I'd say it was a postal issue but it's multiple orders.

I wish I had more control of the postal system however I don’t.  

One way to assure better deliverability is to get a list that has been run through postal certifications.